Cutting teeth of gear-wheels



UNITE srn'rns PATENT oFFIoE.

G. W. BIGELOW, OF NEV HAVEN, CONNECTICUT.

CUTTDTG TEETH OF GEAR-WHEELS.

Specicaton of Letters Patent No. 13,813, dated November 20, 18.55.

To all 'whom 'it may concern:

Be it known that I, G. W. BIGELow, of New Haven, in the county ofNewHaven and State of Connecticut, have invented a new and Improved Machinefor Cutting the Teeth of Gear-Wheels; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the annexed drawings, making a part of this specification,in which- Figure 1, is a longitudinal vertical section of myimprovement, (ai), Fig. 2,

showing the plane of section. Fig. 2, 1s a plan or top view of ditto.Fig. 3, is a detached section of the coil spring and pulley (y), (y),Fig. 2 shows the plane of section.

Similar letters of reference indicate c'orresponding parts in theseveral figures.

The nature of my invention consists in giving the blank or wheel to becut an automatic feed motion as will be presently shown and described.

To enable others skilled in the art to make and use my invention, l willproceed to describe its construction and operation.

A, represents a bed plate supported by legs or a suitable framing and B,represents a head placed or secured on the bed plate so that itl may beadjusted at different points thereon. In the head B, there is placedtransversely a shaft, C, having a pulley D, on one end and a pulley E,on the opposite end. On the shaft C, at about its center there is placeda pinion F, the periphery of which has two smooth portions (a), Atopposite points the other portions of the periphery are provided withteeth (),A as shown clearly in Fig. 1. The front side of the head B, hastwo vertical guides (c), (c), attached to it between which a slide or ycutter stock, Gr, is fitted and allowed to slide freely up and down. Theback side of the slide or cutter stock has a rack (el), cut in it inwhich rack the teeth of the pinion F, gears when the slide or cutterstock is forced downward the periphery of the pinion projecting througha slot cut in the front plate of the head B. Y l

H, is a spring the back end of which is attached to the bottom plate ofthe head B. The front end of the spring bears against the under side ofthe slide or cutter stock, G. The cutter which is of the usual bur formis placed on a small shaft in the slide or stock, G.

I, is the driving shaft placed at one end of the bed A, and having apulley, J, upon it around which a cross belt K, passes, said belt alsopassing around the pulley D, at one end of the shaft, C.

Transversely underneath the bed, A, there are placed two shafts, L, M,which are connected by gear wheels, N, N, at one end. The end`of theshaft, M, has a circular or cam shaped plate, O, attached to itadjoining its gear wheel. This plate has two shoulders or projections(e), (e) at opposite points of its periphery. The opposite end of theshaft M, has a hollow pulley, I), placed loosely upon it and a coilspring, Q, is placed within the pulley the inner end of the spring beingattached to the shaft, M, and the outer end to. the inner periphery orside of the pulley, P, as clearly shown in Fig.V 3.

R, is a belt which passes around the hollow pulley, P, and around thepulley, E, at the end of the shaft, C.

Upon the shaft, L, at about its center there is placed a screw S, whichgears into a worm wheel, T, attached to the lower end of a shaft, U,which passes vertically through the bed, A. The shaft U, has a boss, V,upon it which boss rests upon a collar, WV, which encompasses the shaftand rests upon the bed A, see Fig. l.

X, is a pawl attached by a pivot (f), to i one side of the bed, A. Thispawl has a spring (g), bearing under its outer or back end which springkeeps the front end of the pawl bearing upon the periphery of thecircular plate, O, on the shaft, M.

Y, is a bar one end of which is attached by a pivot to the side of thebed A. This bar has projections on its opposite end which projectionbears upon the outer end of the pawl X, see dotted lines Fig. l. The barY has an arm Z, attached to it, the upper end of which bar has a recess7b), made in it, in which recess pins on the inner side of the pulley D,catch at certain times as will be presently shown.

Operation: The blank or wheel to be operated upon, shown in blue Fig. 1,is placed upon the upper end of the shaft U, the edge of the blank orwheel will then project the requisite distance underneath the cutter inthe slide or stock G the head B being adjusted so as to bring the cutterin the proper position. Motion is then given the driving shaft I, in anyproper manner and the shaft C, will rotate and the pinion F, will forcedown the slide or stock G, and the cutter will cut a recess in theperiphery of the blank, and when the cutter has performed its work oneof the smooth portions (a) of the periphery of the inion F, will come incont-act with the rack (cZ),and the spring H, will throw up the slide orstock G, to its original position. Just previous to the termination ofthe downward stroke of the slide or stock G, one of the pins (i), willcatch into the recess (h) in the upper end of the arm Z, and will raisethe bar Y and the belt R, while the slide or stock G, is descending willwind up the coil spring Q, the shaft M, being prevented from turning inconsequence Vof the pawl X, bearing against one of the shoulders orprojections (e), on the circular plate O. As soon as the slide or stockG, is thrown up by the spring H, the pin (i), will pass out of therecess (71,), in the arm Z, and the bar Y will fall and strike upon theouter end of the pawl X, and throw the inner end free from the shoulderor projection (e), and the coil spring Q, will then rotate the shaft M,about half a revolution or until the pawl catches against the otherprojection or shoulder (e), and the shaft L, will also be rotated inconsequence of the gear wheels N, N, and the screw S, will turn theworm, wheel T, and the blank will beturned a requisite distanceaccording to the size of the blank vor the thickness of the teeth uponthe blank. The blank may be turned a greater or less distance at eachstroke of the slide or cutter stock by placing gifl'rent sized wheels N,N, upon the shafts By the above invention the teeth of wheels are cutsolely by the machine. The attendant merely putting the blank upon theshaft U, and taking the finished wheels therefrom. The machine worksrapidly and well. The machines in use have no automatic feed movementthe blank being moved around by hand.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is,

Giving the blank or wheel to be cut an automatic feed motion by means ofthe pulley P, on the shaft M, said pulley having a coil spring Q, withinit the screw S on the shaft L, the worm wheel T, on the lower end of theshaft U, and the circular plate O, having projections (e), (e), upon itsperiphery and the pawl X, and bar Y, provided with the arm Z, the armbeing operated by the pins (i), on the inner side of the pulley D, theabove parts being arranged substantially as shown and described.

G. W. BIGELOW.

Witnesses;

CHARLES IvEs, HOBART B. BIGELoW.

